Induced pluripotent stem cells(i PSCs) have become one of the research focuses in medicine, biology, and so on, because they have the characteristics of self-renewal and differentiation which are similar to embryonic stem cells(ESCs). But the generation of i PSCs mainly depended on the expression of transcription factors mediated with retrovirus or lentivirus-based vector, these i PSCs bear certain risks, such as tumorigenicity, which resulted from the integration of exogenous genetic materials and viral ve...